Hint: The half life of an element is the amount of time it takes for half of that element sample to decay into a different
element
Based on the graph of radioactive decay for Co-60, how many years does it take for a 10 gram sample of Co-60 to decay into a 125
gram sample?
-0.)
A)
3 years
B)
5.27 years
15.8 years
D)
3 half lives
^ $* ENG
Answers
Answer:
Concept: Half-life
Just a general tip, learn to format your question and fix any grammatical issues. Post the question as a picture instead next time, because the copy and pasting clearly failed for you. I'm assuming you mean 1.25 grams.So it would take 3 yearsRelated Questions
What is the only force that acts on a falling body when it is in free fall?
Answers
Answer:
Gravity
Explanation:
Objects that are experiencing free fall, are not encountering a significant force of air resistance or as a matter of fact any other kind of forces, they are falling under the complete control of gravity.
On the basis of Boyle's law, explain why
mountaineers carry oxygen cylinders with them.
Answers
Answer:
Boyle's Law states that 'at constant temperature, the pressure of a fixed amount of gas varies inversely with the volume of the gas. Mountaineers have to carry oxygen cylinders with them to restore normal breathing because at high altitude the density of air is less.
Explanation:
I majored in Chemistry.
What is the difference between chlorine -35 and chlorine -37??
Answers
Answer:
Free chlorine involves the amount of chlorine that's able to sanitize contaminants, while combined chlorine refers to chlorine that has combined directly with the contaminants. Total chlorine is basically the sum of free chlorine and combined chlorine.
will mark brainliest
Answers
Answer:
D. water
Hope it will help you......two or more atoms joined together form a _____
Answers
Answer:
It makes a molecule
Explanation:
Jane believe that plate tectonics is a theory, and Mario believes it is a law. Which of the following best support Jane's argument?
Answers
Answer:
A
Explanation:
i did this and its right
Balance the combustion reaction between octane and oxygen. 2C8H18 + O2 → CO2 + H2O
Answers
Answer: 2C8H18 + 25O2 -> 16CO2 + 18H2O
Explanation:
What is it called when elements combine to form a chemical compound?
Answers
Explanation:
A compound is a unique substance that forms when two or more elements combine chemically.Compounds form as a result of chemical reactions. The elements in compounds are held together by chemical bonds. A chemical bond is a force of attraction between atoms or ions that share or transfer valence electrons.hope it helpful ✌️✌️
Which of the following statements is true about single-replacement reactions?
1)They are restricted to metals.
2)They involve a three products.
3)Both the reactants and products consist of an element and a compound.
4)Any metal replaces any other metal.
Answers
Explanation:
i think is, They involve a three products.
The statement which is true about single-replacement reactions are:
3) Both the reactants and products consist of an element and a compound.
Single-replacement reactions :These reactions are also known as single displacement reactions, in this type, the ions of the metals or elements get exchanged with the other element and lead to the formation of a new product.
Example: [tex]2K+2H_2O--- > 2KOH+H_2[/tex]
The ions of water get exchanged with potassium and form a new salt that is potassium hydroxide.
Thus, option 3 is correct.
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How many atoms of oxygen are represented in 2CaNO3?
Answers
Answer:
6 atoms of oxygen
Explanation:
The skeletal structure of Arachidonic acid, an essential fatty acid, is provided below. Arachidonic acid is best classified as:
Answers
Skeletal structure is missing, so i have attached it.
Answer:
Option B: Omega 6 fatty acid
Explanation:
Arachidonic Acid is defined as an essential and unsaturated fatty acid. It's usually found in animal and human fat including the liver, brain, and also glandular organs. While in animals, it is a constituent of their phosphatides.
Arachidonic Acid is formed as a result of the synthesis from dietary linoleic acid and it's a preliminary stage in the biosynthesis of prostaglandins, thromboxanes, and leukotrienes.
In short, Arachidonic acid is basically a long-chain fatty acid which is a C20, Omega 6 polyunsaturated fatty acid that has four Z-double bonds.
A compound having an approximate molar mass of 165 - 170 g has the following...
A compound having an approximate molar mass of 165 - 170 g has the following percentage composition by mass: carbon, 42.87%; hydrogen, 3.598%; oxygen,
28.55%; nitrogen, 25.00%. Determine the empirical and molecular formulas of
the compound.
Answers
Answer:
Find ratio of atoms for empirical formula, divide mass by atomic mass
C=42.87/12 = 3.57
H= 3.598/1 = 3.598
O= 28.55/16 = 1.784
N= 25.00/14 =1.1785
to see ratio, divide by smallest no
Gives C2H2ON for empirical formula
Empirical mass = 24 +2 +16 + 14 = 56
165 to 170 /56 = 3
so molecular formula = empirical formula x 3= C6H6O3N3
1. The empirical formula of the compound is C₂H₂ON
2. The molecular formula of the compound is C₆H₆O₃N₃
1. Determination of the empirical formula.From the question given above, the following data were obtained:
Carbon (C) = 42.87%
Hydrogen (H) = 3.598%
Oxygen (O) = 28.55%
Nitrogen (N) = 25.00%
Empirical formula =?C = 42.87%
H = 3.598%
O = 28.55%
N = 25.00%
Divide by their molar mass
C = 42.87 / 12 = 3.5725
H = 3.598 / 1 = 3.598
O = 28.55 / 16 = 1.7844
N = 25.00 / 14 = 1.7857
Divide by the smallest
C = 3.5725 / 1.7844 = 2
H = 3.598 / 1.7844 = 2
O = 1.7844 / 1.7844 = 1
N = 1.7857 / 1.7844 = 1
Therefore, the empirical formula of the compound is C₂H₂ON
2. Determination of the molecular formula.Molar mass of compound = (165 + 170)/2
Molar mass of compound = 335/2
Molar mass of compound = 167.5 g/mol
Empirical formula = C₂H₂ON
Molecular formula =?Molecular formula = Empirical formula × n = molar mass of compound
[C₂H₂ON]n = 167.5
[(12×2) + (2×1) + 16 + 14]n = 167.5
[24 + 2 + 16 + 14]n = 167.5
56n = 167.5
Divide both side by 56
n = 167.5 / 56
n = 3
Molecular formula = [C₂H₂ON]n
Molecular formula = [C₂H₂ON]₃
Molecular formula = C₆H₆O₃N₃Therefore, the Molecular formula of the compound is C₆H₆O₃N₃
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Do sulphates react with acids
Answers
no it cannot I hope I helped
Answer:
Can not
Explanation:
Because both are salts of sodium and hydroxide
equivalent mass of AL2O3
Answers
Answer:
[tex]Mass = 102g[/tex]
Explanation:
Given
Compound: [tex]Al_2O_3[/tex]
Required
Determine the equivalent mass
In the above compound, we have: 2 Al and 3 (O)
The atomic mass of Aluminium is:
[tex]Al = 27[/tex]
The atomic mass of Oxygen is:
[tex](O) = 16[/tex]
So, the equivalent mass is:
[tex]Mass = 2 * 27 + 3 * 16[/tex]
[tex]Mass = 54 + 48[/tex]
[tex]Mass = 102g[/tex]
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1/4th of a sample of thorium-232 remains.
How long has the sample been decaying?
Answers
Answer:
Explain:i need this too ;-;
A bus travels 20km in 30 min what is the average speed of the bus
Answers
Answer:
40km/h
Explanation:
v=20km/0.5h=40km/h.
Answer:
average speed=distance/time
speed=20/30
speed=2/3
13. The quality of petrol as an engine
fuel improves with a higher amount
of
A. branched chain alkanes.
B. branched chain alkenes.
C. branched chain alkynes.
D. straight chain alkynes.
E. straight chain alkynes.
Answers
Answer:
The correct option is;
A. Branched chain alkanes
Explanation:
By the process of cracking of petroleum, higher quality petrol are formed by converting straight chain petrol to branched petrol, which are the grade of petrol that burns more smoothly and therefore efficiently within internal combustion engines
The cracking process includes;
a) The conversion of alkanes which are large molecules into branched octanes
b) The conversion of alkanes with straight chain into branched chain alkanes
c) The formation of a branched chain alkane and an alkene from straight chain alkanes
d) The formation of branched chain alkane and hydrogen gas from a straight chain alkane.
A reaction balanced when it shows us the_____ number of atoms are present before and after the reaction.
Answers
Answer:
equal
Explanation:
According to the law of conservation of matter, the number of atoms before and after a chemical reaction should be equal, such that no atoms are, under normal circumstances, created or destroyed.
Complete the chemical name of the compound Col3. Use the periodic table to help form your answer.
Type the correct answer in the box. Spell all words correctly. Use parentheses where appropriate.
Answers
Answer:
Cobalt (III)
Explanation:
Since there is a 3 by iodine and cobalt is a transition metal it means cobalt has a 3 charge and we have to write it in roman numerals
Answer:
cobalt(III)
Explanation:
Do not capitalize
Equation that shows the formula of the reactants and products are called
Answers
Answer:
chemical equation
Explanation:
30 protons 30 electrons how many nuetrons
Answers
Answer:
34 neutrons.
Explanation:
Hope this helps!!
You are asked to get a compound that has a low melting point and cannot
conduct electricity, which would you pick if you saw three bottles labeled as LICI,
NaBr, and BrF. What type of bond did you get?
Answers
Answer:
the third
Explanation:
which equation is derived from the combined gas law?
Answers
Answer:
The correct answer is V1/T1=V2/T2.
Explanation:
Just took the test
Answer:
Its A on edge :)
Explanation:
chlorine is more reactive than sulphur
Answers
Answer:
this is true
Explanation:
chlorine only needs to lose one electron to become stable and sulphur needs to lose two
Classify each of the following elements as
a metal, a nonmetal, or a metalloid:
boron, carbon, aluminum, and silicon.
Answers
The non-metals are boron and carbon. The metal is aluminum and the metalloid is silicon.
Explanation:
non-metal = boron, carbon
metal = aluminum
metalloid = silicon
Non-metal = boron, carbon
Metal = aluminum
Metalloid = silicon
What is metal?A solid material which is lustrous, hard, shiny, malleable, and sonorous with good electrical and thermal conductivity.
Metal is an element which is typically hard, shiny, fusible, malleable, and ductile, with good electrical and thermal conductivity.
A nonmetal is an element that does not have the properties of a metal.
A metalloid is an element having intermediate properties of both metals and nonmetals.
Hence,
Non-metal = boron, carbon
Metal = aluminum
Metalloid = silicon
Learn more about metals here:
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20. Sudan III is used to test for
A. cellulose.
B. fats and oils.
C. glucose.
D. protein.
E. starch.
Answers
Answer:
Lipid tests
Sudan III is a red fat-soluble dye that is utilized in the identification of the presence of lipids, triglycerides and lipoproteins. The Reaction: Sudan III reacts with the lipids or triglycerides to stain red in colour.
Answer:
I think soo fats and oils
What type of force is demonstrated in the image below?
Answers
Answer:an unbalanced force
Explanation: because the forces are uneven one is stronger
what is the net force of 2N 1N 4N?please
Answers
Answer: 7N
Explanation:
I hope this helps :)
Which process is caused by natural selection
Answers
Answer:
Four general conditions necessary for natural selection to occur are: More organisms are born than can survive. Organisms vary in their characteristics, even within a species. Variation is inherited.
Answer:
Natural selection can lead to speciation, where one species gives rise to a new and distinctly different species. It is one of the processes that drives evolution and helps to explain the diversity of life on Earth.
Explanation:
5. (10 Points) Write a synthesis reaction where one of the reactants is aluminum.
Include the states of matter for each of the reactants and products.
Answers
Answer:
A reaction in which two or more reactants combine to form only one product is called a synthesis reaction.
Explanation: